RFR: 6973: New Method Profiling Page for JMC

[Jason Zaugg]

On Thu, 26 Nov 2020 13:43:55 GMT, Jason Zaugg <jzaugg at openjdk.org> wrote:

>> The predecessor/successor panel also seems useful for other events (e.g. TLAB allocations). Any plans to make this available outside of the CPU profiling page?
>
> I would suggest leaving the pred/succ treeviews empty when the more than one row is selected in the top methods pane. Currently, the first selected element is reflected.

I've tested with this .jfr file: https://drive.google.com/file/d/1OqMOFLsODHgRPKybUfw7rK7kv3j9fES3/view?usp=sharing

Selecting `scala.runtime.Statics.releaseFence()` as the Top Method (source code https://github.com/scala/scala/blob/9a716985fcfbb687a3b4cfe97e8eb1d88a65057d/src/library/scala/runtime/Statics.java#L147-L149)

I see Successors that are not called from the method:

<img width="927" alt="image" src="https://user-images.githubusercontent.com/65551/100360273-74c66300-3044-11eb-842e-7fbe7f234170.png">

I can find no CPU sample events that include this method as a non-leaf element in the stack.

Is is possible that something is wrong with the data filtering in the new UI?

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PR: https://git.openjdk.java.net/jmc/pull/165